Wisconsin Water Quality Ratings
TapWaterSafety has rated 13 public water systems in Wisconsin, serving a combined 2,465,158 residents. The statewide average grade is D.
State average grade
D
Total utilities rated
13
Population served
2,465,158
Most recent test
2024
🇪🇺 Would fail EU standards
1 of 13
Top water quality concerns in Wisconsin
- PFAS contamination
- Total PFOS and PFOA significantly above health guideline
- Haloacetic acids (HAA9) significantly above health guideline
- Perfluorohexane sulfonate (PFHXS) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
Cities in Wisconsin
Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.
Grade distribution
All rated utilities in Wisconsin
Sorted by score, highest first. Click any utility to see the full grade card.
| Rank | Utility | City | Population | Score | Grade |
|---|---|---|---|---|---|
| #1 | Milwaukee Water Authority | Milwaukee | 590,000 | 74 | C |
| #2 | Madison Department of Public Works | Madison | 259,000 | 72 | C |
| #3 | MILWAUKEE WATERWORKS | MILWAUKEE | 626,000 | 67 | C |
| #4 | WEST ALLIS WATERWORKS | WEST ALLIS | 63,240 | 66 | C |
| #5 | EAU CLAIRE WATERWORKS | EAU CLAIRE | 70,587 | 65 | C |
| #6 | JANESVILLE WATER UTILITY | JANESVILLE | 64,415 | 62 | D |
| #7 | APPLETON WATERWORKS | MENASHA | 74,511 | 62 | D |
| #8 | OSHKOSH WATERWORKS | OSHKOSH | 63,000 | 61 | D |
| #9 | MADISON WATER UTILITY | MADISON | 272,000 | 59 | D |
| #10 | KENOSHA WATER UTILITY | KENOSHA | 99,218 | 56 | D |
| #11 | GREEN BAY WATERWORKS | GREEN BAY | 107,369 | 56 | D |
| #12 | RACINE WATERWORKS | RACINE | 105,100 | 53 | F |
| #13 | WAUKESHA WATER UTILITY | WAUKESHA | 70,718 | 53 | F |